期刊
NDT & E INTERNATIONAL
卷 83, 期 -, 页码 38-47出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2016.06.001
关键词
EMAT; Guided waves; Lamb wave; Ultrasonics
资金
- Global Frontier R&D Program on Center for Wave Energy Control based on Metamaterials - National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [2014M3A6B3063711]
This paper investigates a method to generate only symmetric omnidirectional Lamb waves and proposes specially-tuned double-coil EMATs. While methods to generate omnidirectional Lamb waves have been reported, the symmetric mode is typically accompanied by unwanted antisymmetric modes. The double spiral coil works as a wavelength filter but the relation between the coil geometries and the wavelength of the symmetric mode that minimizes the unwanted antisymmetric mode has not been established. Axisymmetric analysis was performed to find the relation. Excellent rejection of antisymmetric modes with successful symmetric mode generation was confirmed by experimental results that favorably agree with the theoretical results. (C) 2016 Elsevier Ltd. All rights reserved.
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